SN4 ""

No	Pattern	Freq
1	[noun] is that [pron] [vb -s]	855
2	[noun sg] is that [pron] [vb -s]	769
3	[adj] is that [pron] [vb -s]	73
4	[verb] is that [pron] [vb -s]	66
5	[pron] is that [pron] [vb -s]	54
6	[noun pl] is that [pron] [vb -s]	49
7	[pers pn] is that [pron] [vb -s]	41
8	[noun prp] is that [pron] [vb -s]	32
9	approach is that [pron] [vb -s]	30
10	it is that [pron] [vb -s]	30
11	approach is that [pron] [vb -s]	30
12	it is that [pron] [vb -s]	30
13	[det] is that [pron] [vb -s]	28
14	[adj] is that [pron] [vb -s]	24
15	[adv] is that [pron] [vb -s]	24
16	theory is that [pron] [vb -s]	19
17	theory is that [pron] [vb -s]	19
18	[adv] is that [pron] [vb -s]	18
19	[vb infin] is that [pron] [vb -s]	17
20	system is that [pron] [vb -s]	16
21	thing is that [pron] [vb -s]	16
22	system is that [pron] [vb -s]	16
23	thing is that [pron] [vb -s]	16
24	problem is that [pron] [vb -s]	15
25	this is that [pron] [vb -s]	15
26	this is that [pron] [vb -s]	15
27	problem is that [pron] [vb -s]	14
28	[num ord] is that [pron] [vb -s]	13
29	view is that [pron] [vb -s]	12
30	answer is that [pron] [vb -s]	12